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Hemoglobin, alpha 2 [5] also known as HBA2 is a gene that in humans codes for the alpha globin chain of hemoglobin. [6] [7] Function. The human alpha globin gene ...
Hemoglobin A2 (HbA 2) is a normal variant of hemoglobin A that consists of two alpha and two delta chains (α 2 δ 2) and is found at low levels in normal human blood.Hemoglobin A2 may be increased in beta thalassemia or in people who are heterozygous for the beta thalassemia gene.
Two alpha chains plus two beta chains constitute HbA, which in normal adult life accounts for about 97% of the total hemoglobin; alpha chains combine with delta chains to constitute HbA-2, which with fetal hemoglobin (HbF), composed of alpha and gamma chains, make up the remaining 3% of adult hemoglobin. [6]
Hemoglobin A (HbA) is the most common adult form of hemoglobin and exists as a tetramer containing two alpha subunits and two beta subunits (α2β2). [3] Each subunit contains a heme group that diatomic oxygen (O 2) molecules can bind to. [5]
Hemoglobin Portland II (ζ 2 β 2). In fetuses: Hemoglobin F (α 2 γ 2; In neonates (newborns inmmediately after birth): Hemoglobin A (adult hemoglobin) (α 2 β 2 ) – The most common with a normal amount over 95%; Hemoglobin A 2 (α 2 δ 2) – δ chain synthesis begins late in the third trimester and, in adults, it has a normal range of 1. ...
The normal hemoglobin types are Hemoglobin A (HbA), which makes up 95–98% of total hemoglobin in adults, Hemoglobin A2 (HbA2), which constitutes 2–3% of total hemoglobin in adults, and Hemoglobin F (HbF), which is the predominant hemoglobin in the fetus during pregnancy, and may persist in small amounts in adults. [1]
Fetal hemoglobin, or foetal haemoglobin (also hemoglobin F, HbF, or α 2 γ 2) is the main oxygen carrier protein in the human fetus. Hemoglobin F is found in fetal red blood cells , and is involved in transporting oxygen from the mother's bloodstream to organs and tissues in the fetus.
Alpha-thalassemia (α-thalassemia, α-thalassaemia) is an inherited blood disorder and a form of thalassemia.Thalassemias are a group of inherited blood conditions which result in the impaired production of hemoglobin, the molecule that carries oxygen in the blood. [5]